Finding the Fourth Proportional to 51,431.72, 77,176.72 and 20,288.84

Step by Step Solution

1. Step 1: Write the proportion equation
   51,431.72 : 77,176.72 = 20,288.84 : x
2. Step 2: Convert to fraction form
   51,431.72/77,176.72 = 20,288.84/x
3. Step 3: Cross multiply
   51,431.72x = 77,176.72 × 20,288.84
4. Step 4: Simplify right side
   51,431.72x = 1,565,826,123.80
5. Step 5: Solve for x
   x = 1,565,826,123.80/51,431.72
6. Step 6: Final answer
   x = 30,444.76